CA1195590A - Power take-off lever arrangement for a tractor - Google Patents
Power take-off lever arrangement for a tractorInfo
- Publication number
- CA1195590A CA1195590A CA000431259A CA431259A CA1195590A CA 1195590 A CA1195590 A CA 1195590A CA 000431259 A CA000431259 A CA 000431259A CA 431259 A CA431259 A CA 431259A CA 1195590 A CA1195590 A CA 1195590A
- Authority
- CA
- Canada
- Prior art keywords
- lever
- pin
- power take
- keyway
- tractor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000006872 improvement Effects 0.000 claims abstract description 3
- 230000007246 mechanism Effects 0.000 claims abstract description 3
- 230000009471 action Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 101150081025 FAL1 gene Proteins 0.000 description 1
- 101100280650 Schizosaccharomyces pombe (strain 972 / ATCC 24843) tif412 gene Proteins 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000576 supplementary effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
- G05G1/04—Controlling members for hand actuation by pivoting movement, e.g. levers
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
- G05G5/005—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for preventing unintentional use of a control mechanism
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/70—Interfitted members
- Y10T403/7018—Interfitted members including separably interposed key
- Y10T403/7021—Axially extending
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20012—Multiple controlled elements
- Y10T74/20018—Transmission control
- Y10T74/20085—Restriction of shift, gear selection, or gear engagement
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20576—Elements
- Y10T74/20636—Detents
- Y10T74/20642—Hand crank
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20576—Elements
- Y10T74/20636—Detents
- Y10T74/2066—Friction
Abstract
AN IMPROVED POWER TAKE-OFF LEVER ARRANGEMENT FOR A TRACTOR
Abstract of the Disclosure An improved power take-off lever arrangement for a tractor is disclosed which prevents the inadvertent shifting of the PTO
lever from a first to a second position. The lever arrangement includes a support plate secured to the tractor and has a pin extending outward therefrom which engages an oval aperture formed in a manually operated lever. The lever is connected to a control valve for hydraulically engaging a power take-off drive. The control valve is responsive to move to a second position with corresponding movement of the lever and is spring biased to move to a first position with corresponding movement of the lever when the hydraulic pressure falls below a predetermined value. The lever is also spring biased to the first position such that an attachment mechanism formed on both the lever and the pin engages. The improvement includes a keyway formed in the periphery of the pin which is aligned with and engages the keyway when the lever is in the first position and is out of alignment with the keyway but is in contact with the periphery of the pin when the lever is in the second position.
Abstract of the Disclosure An improved power take-off lever arrangement for a tractor is disclosed which prevents the inadvertent shifting of the PTO
lever from a first to a second position. The lever arrangement includes a support plate secured to the tractor and has a pin extending outward therefrom which engages an oval aperture formed in a manually operated lever. The lever is connected to a control valve for hydraulically engaging a power take-off drive. The control valve is responsive to move to a second position with corresponding movement of the lever and is spring biased to move to a first position with corresponding movement of the lever when the hydraulic pressure falls below a predetermined value. The lever is also spring biased to the first position such that an attachment mechanism formed on both the lever and the pin engages. The improvement includes a keyway formed in the periphery of the pin which is aligned with and engages the keyway when the lever is in the first position and is out of alignment with the keyway but is in contact with the periphery of the pin when the lever is in the second position.
Description
s~
Eield oE _he Invention This invention relates to an improved power take-off lever arrangement for a tractor which prevents the inadvertent shiEting of the PTO lever Erom a first to a second position.
_a~ und o-E the Invention Most agricul-tural tractors and some industrial tractors are provided with a rear mounted power take-off drive which is used to transmit power to an attached implement. Operation of the ~ower take-oEf drive is controlled by a lever normally mounted on the left-hand side oE the steering column. This lever, which extends through the dashboard, is susceptible to being bumped or knocked as the driver enters or exits the tractor cab. The possibility of inadvertently engaging the power take-off (PTO) presents a safety risk especially to another person who may be working on an attached implement, which is connected to the PTO
drive, in the belief that the PTO is disengaged.
One method for yreventing such engagement is described in Canadian application Serial No~ 408/273, filed on 28 July 1982, wherein a roller, which is attached to the lever, is capable of engaging in a recess formed on an arcuate sector which is fixed to a pin. The lever is spring biased to a position such that the roller will engage the recess when the lever is in the disengaged position. Although such a lever has proved to be very successful in overcoming the inadvertent shifting problem, it has been noticed that on rare occasions, the lever is still capable of moving to the engaged position should the roller roll out of the recess. O~her disadvantage~ of the pin lever arrangement are that it is complicated in structure and is rather costly to manufacture and assemble.
S mary of the _ vention Briefly, this invention relates to an improved power take-off lever arrangement for a tractor which has a support plate secured to the tractor and has a pin extending outward therefrom. The pin engages with an oval aperture formed in a manually opera-ted lever. The lever is connected to a control valve for hydraulically engaging a power take-off drive. The control valve is spring biased to move to a first (disengaged) position with corresponding movement of the lever when the hyo~au1ic pressure fal1~ telow a predetermined value, and i J
3~3 1 responsive to move to a second (engaged) position with corresponding movement of the lever. The lever is further spring biased to a first position such that an attachment mechanism formed on both the lever and the pin engages to prevent the inadvertent shifting of the lever. The improvement includes a keyway formed in the periphery of the pin which is aligned parallel to the central axîs of the pin and a key formed on the inner circumference of the oval aperture. The key is aligned with and engages the keyway when the lever is in the first position and is out of engagement with the keyway but in contact with the periphery of the pin when the lever is in the second position. Such a lever arrangement makes it virtually impossible for the lever to be inadvertently moved to the second position.
The general object of this invention is to provide an improved power take-off lever arrangement for a tractor which prevents inadvertent shifting of the PTO lever from a first to a second position. A more specific object of this invention is to provide an improved power take-off lever arrangement for a tractor which is simple in construction and economical to build.
Another object of this invention is to provide an improved power take-off lever arrangement for a tractor which has a minimum number of moving parts.
~5 Still another object of this invention is to provide an improved power take-off lever arrangement for a tractor which utilizes a keyway and an engaging key to physically prevent the lever from being inadvertently shifted to the second position.
Other objects and advantages of the present invention will become more apparent to those skilled in the art in view of the following description and the accompanying drawings.
Brief Description of the Drawings Fi~. 1 is a side elevation view of the improved power take-off lever arrangement.
Fig. 2 is a view of the improved PTO lever arrangement from below taken along the line 2--2 of Fig~ 1 and including a PTO
control valve and drive.
Detailed Description of the Preferred Embodiment Referring to the drawings, an improved power take~off lever ~` 40 arrangement 10 is shown having a l~ver 12 which is pivotally ,, ~5S~O
1 attached by a pin 14 to a support plate 16. The support plate 16 is attached to the frame of a tractor behind a dashboard 18.
The lever 12 projects through a slot 20 formed in the dashboard 18 and has a grip 22 formed on its exposed end for permitting an operator to move the lever 12 between a first position (PTO
drive is disengaged) shown in solid lines in Fig 1, and a second position (PTO drive is engaged) shown at l~A in broken lines. Normally, the PTO shift levler 12 is located just to the left of the steering column of the tractor and i5 susceptible to being bumped or knocked as the operator enters or exits the tractor cab.
An inner end of the lever 12 is pivotally connected by a stud 24 to a link 26 which is connected to a power take-off control valve 28, see Fig. 2. The PTO control valve 28 includes a movable spool 30 which is biased by a spring 32 to a first (disengaged~ position, indicated by the right most position in Fig. 2. As the movable spool 30 is moved to the left to a second (engaged) position, hydraulic pressure from a supply pump 31 is routed through a line 33 and a groove 34, which is formed in the spool 30, to a hydraulically activated clutch 36. By engaging or disengaging the clutch 36, a power take-off drive 38 can be engaged or disengaged, respectively. When the power take-off drive 38 is engaged, its output shaft rotates and this power can be used to drive an attached implement.
Upon shifting the lever 12 from the first to the second position 12A, the link 26 is moved such that it pushes the spool 30 inward and compresses the spring 32. As this occurs, detent balls 40 positioned about the spool 30 and movable by hydraulic pressure engage in a groove 42 formed in the periphery of the 30 spool 30. The detent balls 40 therefore will hold the spool 30 in the second position until the spool 30 is physically moved back to the right by movement of the lever 12 back to the first position or when the hydraulic line pressure falls below a predetermined value. In the latter situation, the force of the spring 32 will move the spool 30 to the right and cause the detent balls 40 to move out of the groove 42. Such action will cause the link 26 to move outward as indicated by arrow 26A in Fig. 1 and thus pivot the lever 12 back to the first position.
Details of a PTO control valve can be found in U.S. patent 9~
1 4,296,649 which issued to Marquart in 1931.
The lever 12 is pivotally mounted on the Eixed pin 14 by way oE an oval aperture 44. The oval aperture 44 permits the lever 12 -to move radially in and out relative to the dashboard 18.
Besides being able to move in and out relative to the pin 14, the lever 12 is also drawn inward relative to the dashboard 18 by a tension spring 46 which is stretched between an aperture 48 formed in the lever 12 and a pin 50 secured to the support plate 16.
The improved PTO lever arrangement 10 further includes a keyway 52 which is formed in the periphery of the pin 14 such that it is aligned parallel to the central axis of the pin 1~.
The keyway 52 contains parallelly aligned side surfaces, 54 and 56, which are perpendicularly arranged with a bottom surface 58. The keyway 52 is sized to receive a key 60 formed on the inner circumferential surface of the oval aperture 44. The key 60 is aligned with and engages the keyway 52 when the lever 12 is in the first position. When the lever 12 is in the second position, the key 60 is in contact with the periphery of -the pin 14. Preferably, the key 60 contains a concave surface 62 which is similar to the peripheral arc of the pin 140 These ma-ting surfaces permit a minimum amount of frictional contact to be present between the lever 12 and the pin 14 as the lever 12 is shifted between positions. It should be mentioned that this frictional contact is insufficient to affect the rnovement of the lever 12 to the first position when the hydraulic pressure indirectly acting on the control valve 28 falls below a predetermined value.
The key 60 also has parallelly arranged side surfaces, 64 and 66, which are aligned parallel to the keyway side surfaces, 54 and 56, when the key 60 engages the keyway 52. This parallel arrangement ensures that the lever 12 cannot be inadvertently shifted to the second position.
In order to move the lever 12 to the second position 12A, it is necessary that the operator first pull the lever 12 outward towards himself and against the force of the spring 46 to a position 12B (indicated by broken lines) beEore the lever 12 can be shifted over to the second position 12A~ When the lever 12 is in the second position 12A, the spring 46 will pull against , , ;.
.
, ' .
5~
1 the lever 12 such that a force is present to urge the key 60 back into the keyway 52. This force created by the spring 46 i5 small and, although it assists the bias of the spring 32 acting on the spool 30 of the PTO control valve 28, it will not overcome the holding action of the detent balls 40. If desired, the supplementary action of the tension spring 46 can be compensated for by a slight reduction in the strength of the spring 32 located in the PTO control valve 28.
If the hydraulic line pressure sho~ld fall below a predetermined value, whereby the detent balls 40 are no longer able to hold the spool 30 of the PTO control valve 28 in the second posi~ion, the spring 32 will force the spool 30 and the link 26 to move outward. This action will cause the key 60 to ride along the peripheral surface of the pin 14 as the lever 12 pivots back to the first position. The key 60 will positively snap back into the keyway 52 once the lever 12 reaches the first position due to the force of the spring 46. Likewise, when the lever 12 is pulled back by hand to the first position, the spring 46 will ensure that the key 60 positively snaps back into the keyway 52.
While the invention has been described in conjunction with a specific embodiment, it is to be understood that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the aforegoing description. Accordingly, this invention is intended to embrace all such alternatives, modifications, and variations which fall within the spirit and scope of the appended claims.
Eield oE _he Invention This invention relates to an improved power take-off lever arrangement for a tractor which prevents the inadvertent shiEting of the PTO lever Erom a first to a second position.
_a~ und o-E the Invention Most agricul-tural tractors and some industrial tractors are provided with a rear mounted power take-off drive which is used to transmit power to an attached implement. Operation of the ~ower take-oEf drive is controlled by a lever normally mounted on the left-hand side oE the steering column. This lever, which extends through the dashboard, is susceptible to being bumped or knocked as the driver enters or exits the tractor cab. The possibility of inadvertently engaging the power take-off (PTO) presents a safety risk especially to another person who may be working on an attached implement, which is connected to the PTO
drive, in the belief that the PTO is disengaged.
One method for yreventing such engagement is described in Canadian application Serial No~ 408/273, filed on 28 July 1982, wherein a roller, which is attached to the lever, is capable of engaging in a recess formed on an arcuate sector which is fixed to a pin. The lever is spring biased to a position such that the roller will engage the recess when the lever is in the disengaged position. Although such a lever has proved to be very successful in overcoming the inadvertent shifting problem, it has been noticed that on rare occasions, the lever is still capable of moving to the engaged position should the roller roll out of the recess. O~her disadvantage~ of the pin lever arrangement are that it is complicated in structure and is rather costly to manufacture and assemble.
S mary of the _ vention Briefly, this invention relates to an improved power take-off lever arrangement for a tractor which has a support plate secured to the tractor and has a pin extending outward therefrom. The pin engages with an oval aperture formed in a manually opera-ted lever. The lever is connected to a control valve for hydraulically engaging a power take-off drive. The control valve is spring biased to move to a first (disengaged) position with corresponding movement of the lever when the hyo~au1ic pressure fal1~ telow a predetermined value, and i J
3~3 1 responsive to move to a second (engaged) position with corresponding movement of the lever. The lever is further spring biased to a first position such that an attachment mechanism formed on both the lever and the pin engages to prevent the inadvertent shifting of the lever. The improvement includes a keyway formed in the periphery of the pin which is aligned parallel to the central axîs of the pin and a key formed on the inner circumference of the oval aperture. The key is aligned with and engages the keyway when the lever is in the first position and is out of engagement with the keyway but in contact with the periphery of the pin when the lever is in the second position. Such a lever arrangement makes it virtually impossible for the lever to be inadvertently moved to the second position.
The general object of this invention is to provide an improved power take-off lever arrangement for a tractor which prevents inadvertent shifting of the PTO lever from a first to a second position. A more specific object of this invention is to provide an improved power take-off lever arrangement for a tractor which is simple in construction and economical to build.
Another object of this invention is to provide an improved power take-off lever arrangement for a tractor which has a minimum number of moving parts.
~5 Still another object of this invention is to provide an improved power take-off lever arrangement for a tractor which utilizes a keyway and an engaging key to physically prevent the lever from being inadvertently shifted to the second position.
Other objects and advantages of the present invention will become more apparent to those skilled in the art in view of the following description and the accompanying drawings.
Brief Description of the Drawings Fi~. 1 is a side elevation view of the improved power take-off lever arrangement.
Fig. 2 is a view of the improved PTO lever arrangement from below taken along the line 2--2 of Fig~ 1 and including a PTO
control valve and drive.
Detailed Description of the Preferred Embodiment Referring to the drawings, an improved power take~off lever ~` 40 arrangement 10 is shown having a l~ver 12 which is pivotally ,, ~5S~O
1 attached by a pin 14 to a support plate 16. The support plate 16 is attached to the frame of a tractor behind a dashboard 18.
The lever 12 projects through a slot 20 formed in the dashboard 18 and has a grip 22 formed on its exposed end for permitting an operator to move the lever 12 between a first position (PTO
drive is disengaged) shown in solid lines in Fig 1, and a second position (PTO drive is engaged) shown at l~A in broken lines. Normally, the PTO shift levler 12 is located just to the left of the steering column of the tractor and i5 susceptible to being bumped or knocked as the operator enters or exits the tractor cab.
An inner end of the lever 12 is pivotally connected by a stud 24 to a link 26 which is connected to a power take-off control valve 28, see Fig. 2. The PTO control valve 28 includes a movable spool 30 which is biased by a spring 32 to a first (disengaged~ position, indicated by the right most position in Fig. 2. As the movable spool 30 is moved to the left to a second (engaged) position, hydraulic pressure from a supply pump 31 is routed through a line 33 and a groove 34, which is formed in the spool 30, to a hydraulically activated clutch 36. By engaging or disengaging the clutch 36, a power take-off drive 38 can be engaged or disengaged, respectively. When the power take-off drive 38 is engaged, its output shaft rotates and this power can be used to drive an attached implement.
Upon shifting the lever 12 from the first to the second position 12A, the link 26 is moved such that it pushes the spool 30 inward and compresses the spring 32. As this occurs, detent balls 40 positioned about the spool 30 and movable by hydraulic pressure engage in a groove 42 formed in the periphery of the 30 spool 30. The detent balls 40 therefore will hold the spool 30 in the second position until the spool 30 is physically moved back to the right by movement of the lever 12 back to the first position or when the hydraulic line pressure falls below a predetermined value. In the latter situation, the force of the spring 32 will move the spool 30 to the right and cause the detent balls 40 to move out of the groove 42. Such action will cause the link 26 to move outward as indicated by arrow 26A in Fig. 1 and thus pivot the lever 12 back to the first position.
Details of a PTO control valve can be found in U.S. patent 9~
1 4,296,649 which issued to Marquart in 1931.
The lever 12 is pivotally mounted on the Eixed pin 14 by way oE an oval aperture 44. The oval aperture 44 permits the lever 12 -to move radially in and out relative to the dashboard 18.
Besides being able to move in and out relative to the pin 14, the lever 12 is also drawn inward relative to the dashboard 18 by a tension spring 46 which is stretched between an aperture 48 formed in the lever 12 and a pin 50 secured to the support plate 16.
The improved PTO lever arrangement 10 further includes a keyway 52 which is formed in the periphery of the pin 14 such that it is aligned parallel to the central axis of the pin 1~.
The keyway 52 contains parallelly aligned side surfaces, 54 and 56, which are perpendicularly arranged with a bottom surface 58. The keyway 52 is sized to receive a key 60 formed on the inner circumferential surface of the oval aperture 44. The key 60 is aligned with and engages the keyway 52 when the lever 12 is in the first position. When the lever 12 is in the second position, the key 60 is in contact with the periphery of -the pin 14. Preferably, the key 60 contains a concave surface 62 which is similar to the peripheral arc of the pin 140 These ma-ting surfaces permit a minimum amount of frictional contact to be present between the lever 12 and the pin 14 as the lever 12 is shifted between positions. It should be mentioned that this frictional contact is insufficient to affect the rnovement of the lever 12 to the first position when the hydraulic pressure indirectly acting on the control valve 28 falls below a predetermined value.
The key 60 also has parallelly arranged side surfaces, 64 and 66, which are aligned parallel to the keyway side surfaces, 54 and 56, when the key 60 engages the keyway 52. This parallel arrangement ensures that the lever 12 cannot be inadvertently shifted to the second position.
In order to move the lever 12 to the second position 12A, it is necessary that the operator first pull the lever 12 outward towards himself and against the force of the spring 46 to a position 12B (indicated by broken lines) beEore the lever 12 can be shifted over to the second position 12A~ When the lever 12 is in the second position 12A, the spring 46 will pull against , , ;.
.
, ' .
5~
1 the lever 12 such that a force is present to urge the key 60 back into the keyway 52. This force created by the spring 46 i5 small and, although it assists the bias of the spring 32 acting on the spool 30 of the PTO control valve 28, it will not overcome the holding action of the detent balls 40. If desired, the supplementary action of the tension spring 46 can be compensated for by a slight reduction in the strength of the spring 32 located in the PTO control valve 28.
If the hydraulic line pressure sho~ld fall below a predetermined value, whereby the detent balls 40 are no longer able to hold the spool 30 of the PTO control valve 28 in the second posi~ion, the spring 32 will force the spool 30 and the link 26 to move outward. This action will cause the key 60 to ride along the peripheral surface of the pin 14 as the lever 12 pivots back to the first position. The key 60 will positively snap back into the keyway 52 once the lever 12 reaches the first position due to the force of the spring 46. Likewise, when the lever 12 is pulled back by hand to the first position, the spring 46 will ensure that the key 60 positively snaps back into the keyway 52.
While the invention has been described in conjunction with a specific embodiment, it is to be understood that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the aforegoing description. Accordingly, this invention is intended to embrace all such alternatives, modifications, and variations which fall within the spirit and scope of the appended claims.
Claims (6)
CLAIMED ARE DEFINED AS FOLLOWS:
1. An improved power take-off lever arrangement for a tractor having a support plate secured to said tractor and having a pin extending outward therefrom which engages an aperture formed in a manually operable lever, said lever being connected to a control valve for hydraulically engaging a power take-off drive, said control valve being responsive to move to a second position with corresponding movement of said lever and being spring biased to move to a first position with corresponding movement of said lever when said hydraulic pressure falls below a predetermined value, said lever further being spring biased to said first position such that an attachment mechanism formed on both said lever and said pin engages, said improvement comprising:
a) a keyway formed in the periphery of said pin which is aligned parallel to the central axis of said pin; and b) a key formed on the inner circumference of said aperture which is formed in said lever, said key being aligned with and engaging said keyway when said lever is in said first position and being out of engagement with said keyway but in contact with the periphery of said pin when said lever is in said second position.
a) a keyway formed in the periphery of said pin which is aligned parallel to the central axis of said pin; and b) a key formed on the inner circumference of said aperture which is formed in said lever, said key being aligned with and engaging said keyway when said lever is in said first position and being out of engagement with said keyway but in contact with the periphery of said pin when said lever is in said second position.
2. The improved power take-off lever arrangement of claim 1 wherein said key has a concave outer surface which is mateable with the outer periphery of said pin.
3. The improved power take-off lever arrangement of claim 2 wherein said key and keyway have parallelly aligned side surfaces.
4. The improved power take-off lever arrangement of claim 2 wherein said key is in frictional engagement with the periphery of said pin when said lever is in said second position.
5. The improved power take-off lever arrangement of claim 1 wherein said keyway contains parallelly aligned side surfaces which are perpendicularly arranged with a bottom surface of said keyway.
6. The improved power take-off lever arrangement of claim 1 wherein said aperture formed in said lever has an oval configuration.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US397,636 | 1982-07-12 | ||
| US06/397,636 US4517855A (en) | 1982-07-12 | 1982-07-12 | Power take-off lever arrangement for a tractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1195590A true CA1195590A (en) | 1985-10-22 |
Family
ID=23572022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000431259A Expired CA1195590A (en) | 1982-07-12 | 1983-06-27 | Power take-off lever arrangement for a tractor |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US4517855A (en) |
| EP (1) | EP0102475B1 (en) |
| JP (1) | JPS5939203A (en) |
| AR (1) | AR231866A1 (en) |
| AT (1) | ATE30644T1 (en) |
| AU (1) | AU552993B2 (en) |
| BR (1) | BR8303701A (en) |
| CA (1) | CA1195590A (en) |
| DE (1) | DE3374357D1 (en) |
| ES (1) | ES524007A0 (en) |
| ZA (1) | ZA835039B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1314157B1 (en) * | 1999-11-11 | 2002-12-04 | New Holland Italia Spa | COMMAND DEVICE FOR VEHICLES, IN PARTICULAR FOR VEHICLES |
| US6533053B2 (en) * | 2001-08-08 | 2003-03-18 | Deere & Company | Quick detachable drive shaft |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US950290A (en) * | 1908-01-09 | 1910-02-22 | Link Belt Co | Slip-gear. |
| US2896315A (en) * | 1957-05-31 | 1959-07-28 | Dubberke Walter Harley | Method for positioning a wheel upon an axle member |
| FR1370101A (en) * | 1963-07-08 | 1964-08-21 | Bennes Marrel | Improvements in devices for handling transport skips and in particular those fitted to trucks |
| US3786690A (en) * | 1972-05-25 | 1974-01-22 | Grand Haven Stamped Prod | Lift gate mechanism |
| US3789694A (en) * | 1973-01-02 | 1974-02-05 | Allis Chalmers | Friction block for lever |
| US3985039A (en) * | 1974-08-13 | 1976-10-12 | Fmc Corporation | Transmission control brake |
| DE3024451C2 (en) * | 1980-06-28 | 1985-12-05 | Elring Dichtungswerke Gmbh, 7012 Fellbach | Shift catch for vehicle gearboxes |
| DE71674T1 (en) * | 1981-08-03 | 1983-07-21 | Deere & Co., 61265 Moline, Ill. | ARRANGEMENT OF A PTO DRIVE CONTROL LEVER FOR A TRACTOR. |
| US4400995A (en) * | 1981-09-23 | 1983-08-30 | Milwaukee Electric Tool Corporation | Spindle lock with impacting capability |
-
1982
- 1982-07-12 US US06/397,636 patent/US4517855A/en not_active Expired - Lifetime
-
1983
- 1983-06-10 AU AU15681/83A patent/AU552993B2/en not_active Ceased
- 1983-06-27 CA CA000431259A patent/CA1195590A/en not_active Expired
- 1983-07-05 EP EP83106534A patent/EP0102475B1/en not_active Expired
- 1983-07-05 AT AT83106534T patent/ATE30644T1/en not_active IP Right Cessation
- 1983-07-05 DE DE8383106534T patent/DE3374357D1/en not_active Expired
- 1983-07-08 AR AR293571A patent/AR231866A1/en active
- 1983-07-11 ZA ZA835039A patent/ZA835039B/en unknown
- 1983-07-11 BR BR8303701A patent/BR8303701A/en unknown
- 1983-07-11 ES ES524007A patent/ES524007A0/en active Granted
- 1983-07-12 JP JP58126836A patent/JPS5939203A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| ES8500470A1 (en) | 1984-10-01 |
| EP0102475B1 (en) | 1987-11-04 |
| AU1568183A (en) | 1984-01-19 |
| JPS5939203A (en) | 1984-03-03 |
| AU552993B2 (en) | 1986-06-26 |
| EP0102475A2 (en) | 1984-03-14 |
| EP0102475A3 (en) | 1985-05-22 |
| AR231866A1 (en) | 1985-03-29 |
| BR8303701A (en) | 1984-02-14 |
| DE3374357D1 (en) | 1987-12-10 |
| ZA835039B (en) | 1985-02-27 |
| ES524007A0 (en) | 1984-10-01 |
| ATE30644T1 (en) | 1987-11-15 |
| US4517855A (en) | 1985-05-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4541497A (en) | Control mechanism for operating a tractor | |
| CA1139193A (en) | System of changing travelling speed of working vehicle | |
| US5048638A (en) | System for controlling the ground speed and direction of travel of an off-road vehicle | |
| CA1190197A (en) | Operator restraint/control lockout system | |
| CA1195590A (en) | Power take-off lever arrangement for a tractor | |
| CA1044047A (en) | Combination transmission neutralizer and power train interlock system | |
| US4352302A (en) | Control for hydrostatic transmission | |
| US4517856A (en) | Power take-off lever arrangement for a tractor | |
| CA1325955C (en) | System for controlling the ground speed and direction of travel of an off-road vehicle | |
| CA1066920A (en) | Compact transmission | |
| US6364794B1 (en) | Variable speed transmission assembly | |
| US6834485B2 (en) | Independent positive reverse drive mower with brake lockout | |
| US4360067A (en) | Transport lock system for an implement or the like | |
| US6176150B1 (en) | Self-propelled agricultural machine with gear shifting steering column | |
| JP3067074B2 (en) | Operation lever support structure | |
| EP0119194B1 (en) | Control mechanism for operating a tractor | |
| US3762233A (en) | Clutch | |
| JPS6138831Y2 (en) | ||
| US6390226B1 (en) | Differential lock engaging arrangement | |
| JP5391161B2 (en) | Switching operation device | |
| AU551372B2 (en) | Control mechanism for operating a tractor | |
| JPS6230506Y2 (en) | ||
| JPH02199360A (en) | Shift device for transmission | |
| JP2523196Y2 (en) | Engine start safety device in vehicle | |
| JPH02110719A (en) | Multiple operating lever structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |